1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Determinant of a 4x4 Matrix - Check my answer please?

  1. Sep 4, 2013 #1
    1. The problem statement, all variables and given/known data
    Hey guys, I usually have no trouble with 3x3 matrices, and for a 4x4 I've a rough idea how to do it but not entirely sure if I did it correct. I've attached my attempt below with working out.

    The matrix:

    [itex]\begin{pmatrix} 0 & 2 & 0 & 0 \\7 & a+1 & 3 & a+1 \\1 & 0 & 2 & 0 \\ a & 1 & a-2 & 0 \end{pmatrix}[/itex]

    2. The attempt at a solution

    My working out, question 6a here: oad8bo.jpg

    And the answer I got is: [itex] 2a^2 + 6a + 4 [/itex]

    Could anyone give me a quick hand as to whether that looks right / if not, how to go about doing it? Cheers
  2. jcsd
  3. Sep 4, 2013 #2


    User Avatar

    Staff: Mentor

  4. Sep 4, 2013 #3
    Your method and solution looks correct.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted

Similar Discussions: Determinant of a 4x4 Matrix - Check my answer please?
  1. 4x4 matrix determinant (Replies: 2)